Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-06-07
1998-10-13
Wu, Daniel J.
Communications: electrical
Condition responsive indicating system
Specific condition
340551, 340572, 235493, G08B 13187
Patent
active
058218599
ABSTRACT:
The invention relates to a special type of magnetic tag that serves both as an identifier of the article to which it is attached and as an antitheft device. The former attribute is especially important should stolen property be recovered. Identification comes about through the use of an array of individual magnetic elements that are closely spaced, preferably along and perpendicular to an amorphous wire or strip. The magnetic elements can take the form of magnetic ink, high coercivity wire, thin foil, or amorphous wire. The array may be personalized (coded) by leaving out elements of the array or driving selected elements to saturation while others remain demagnetized. The elements can also be in the form of a double array to constitute `1`s and `0`s to form a code. Reading of the elements is accomplished with a special reading head consisting or one or more small magnetic circuits coupled to one or more pickup loops. A longer length of soft magnetic wire or thin strip is used to trigger an anti-theft alarm when activated by an external field from a magnetic gate.
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Gambino Richard Joseph
Schrott Alejandro Gabriel
von Gutfeld Robert Jacob
IBM Corporation
Strunck Stephen S.
Wu Daniel J.
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